// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <cstdint>
#include <optional>

namespace kumo::pollux::common::testutil {
    // Used to override the current time for testing purposes.
    class ScopedTestTime {
    public:
        ScopedTestTime();

        ~ScopedTestTime();

        void setCurrentTestTimeSec(uint64_t currentTimeSec);

        void setCurrentTestTimeMs(uint64_t currentTimeMs);

        void setCurrentTestTimeMicro(uint64_t currentTimeUs);

        void setCurrentTestTimeNano(uint64_t currentTimeNs);

        static std::optional<uint64_t> getCurrentTestTimeSec();

        static std::optional<uint64_t> getCurrentTestTimeMs();

        static std::optional<uint64_t> getCurrentTestTimeMicro();

        static std::optional<uint64_t> getCurrentTestTimeNano();

    private:
        // Used to verify only one instance of ScopedTestTime exists at a time.
        static bool enabled_;
        // The overridden value of current time only.
        static std::optional<uint64_t> testTimeNs_;
    };
} // namespace kumo::pollux::common::testutil
